[mpich-commits] [mpich] MPICH primary repository branch, master, updated. v3.2b4-9-gfcbe6bd

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http://git.mpich.org/mpich.git/commitdiff/fcbe6bd1e7795b2f213db7959d20e882abecd075

commit fcbe6bd1e7795b2f213db7959d20e882abecd075
Author: Min Si <msi at il.is.s.u-tokyo.ac.jp>
Date:   Mon Jul 27 14:50:51 2015 -0500

    Added comment to explain why -flat-namespace is necessary.
    
    Signed-off-by: Ken Raffenetti <raffenet at mcs.anl.gov>

diff --git a/configure.ac b/configure.ac
index c0370a2..0ac2285 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6005,6 +6005,12 @@ if test "X$enable_shared" = "Xyes" ; then
         # added in linking stage for both the shared library and the final
         # executable file.
 
+        # In Fortran programs, we implement global definitions such as MPI_BOTTOM
+        # as common symbols. We check the address of the user input and translate it
+        # to the C global definition if it is equal to the internal pre-stored address
+        # in the Fortran binding layer. Without -flat-namespace, we may get different
+        # addresses and thus treat the predefined constant as a normal buffer.
+
         # Although gfortran works fine by only adding -flat-namespace, and
         # ifort works by only adding -Wl,-commons,use_dylibs, we should add
         # both options here as a generic solution to make sure everything safe.

-----------------------------------------------------------------------

Summary of changes:
 configure.ac |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)


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